Diapause and voltinism in western and 2-year-cycle spruce budworms (Lepidoptera: Tortricidae) and their hybrid progeny

2005 ◽  
Vol 137 (5) ◽  
pp. 584-597 ◽  
Author(s):  
V.G. Nealis
Keyword(s):  
Related Species ◽  
Relative Frequency ◽  
Variable Number ◽  
Life Cycles ◽  
Choristoneura Occidentalis ◽  
Hybrid Progeny ◽  
Closely Related Species ◽  
Genetic Traits ◽  
Larval Stages ◽  
Parental Responses

AbstractBreeding experiments and rearing under variable controlled conditions have revealed that western and 2-year-cycle spruce budworms (Choristoneura occidentalis Freeman and C. biennis Freeman, respectively) from British Columbia, Canada, and their hybrid progeny have the inherent capacity for a variable number of diapause events and hence voltinism. While all crosses have at least one diapause, variability in the relative frequency of a second diapause is determined by genetic traits modified by the photoperiod and, to a lesser extent, temperature experienced during the larval stages. Second diapause appears fixed in C. biennis but is facultative and most frequent at short photophases (12L:12D) in C. occidentalis. Hybrids and backcrosses had responses intermediate to the parental responses under all environmental conditions. The occurrence of a facultative third diapause in all crosses underlines the inherent capacity for flexibility in voltinism in these species. These results are discussed in the context of past, present, and future distributions of alternative life cycles in closely related species.

Larval development of the shrimp Hippolyte sapphica d’Udekem d’Acoz, 1993 forma A and B (Decapoda: Caridea: Hippolytidae) reared in the laboratory, confirmation of the conspecific status of the two forms

Zootaxa ◽  
2010 ◽  
Vol 2579 (1) ◽  
pp. 45 ◽  
Author(s):  
ALEXANDROS NTAKIS ◽  
CHRYSSA ANASTASIADOU ◽  
ROMAN LIASKO ◽  
IOANNIS D. LEONARDOS
Keyword(s):  
Related Species ◽  
Morphological Characters ◽  
Experimental Conditions ◽  
Closely Related Species ◽  
Larval Stages ◽  
Laboratory Confirmation ◽  
Bibliographic Data ◽  
Immature Form ◽  
Complete Series ◽  
First Time

The complete series of larval staging of Hippolyte sapphica d’Udekem d’Acoz, 1993 forma A and B from Louros estuary was studied in the laboratory and described in detail for the first time. The reared larvae of H. sapphica passed through six zoeal stages and one megalopal stage. The larval monitoring completed when the individuals could be assigned clearly to form A and B via rostra formation. Under the experimental conditions, the average durations of the larval stages were as follows: three days for 1 st and 2 nd stages, three to four days for 3 rd , 4 th , 5 th and 6 th stages, four days for the megalopal stage and 19 to 30 days for immature form A and B individuals. Comparison of the larval morphological characters among the described material and the bibliographic data of closely related species was made and discussed. The offspring of females of the forma A includes forma A and B and the same can be said of the offspring of the forma B. This confirms that the formae A and B are indeed conspecific.

scholarly journals A New Species of Ligyrocoris Stal With a Key to the Northeastern Species (Hemiptera:Lygaeidae)

1963 ◽  
Vol 70 (1) ◽  
pp. 17-21
Author(s):  
Merrill H. Sweet
Keyword(s):  
New Species ◽  
Life Cycle ◽  
New England ◽  
Related Species ◽  
Habitat Preferences ◽  
Life Cycles ◽  
The Other ◽  
Closely Related Species ◽  
Carex Stricta ◽  
A New Species

In the course of current work upon the biology and ecology of the Rhyparochrominae of New England, a new species of Ligyrocoris was discovered. The species runs in Barber's (1921) key to the couplet separating diffusus (Uhler) from sylvestris (L.), but is distinct from either species. While the new species is closely related to these species, it is also quite close to L. depictus which is separated out in a different part of Barber's key.These four closely related species are sympatric in New England, although they are markedly different in their overall distribution. The habitat preferences and life cycles of the species are quite different (Sweet, unpublished). The habitat of the new species described below is most unusual for the genus. The greater part of the type series was collected along the margin of a small pond where sedge clumps were standing in the water among occasional exposed rocks rather than in relatively dry fields or slope habitats where the other species occur. The species feeds upon the seeds of the sedge, Carex stricta Lam, and its life cycle is apparently adapted to that of the sedge, which fruits in late May and June. The insect becomes adult in mid-June and lays eggs until mid-July. The eggs remain in diapause over the summer and winter and hatch in May.

THE IDENTITIES OF THREE CLOSELY RELATED WESTERN SPECIES OF PROSIMULIUM (DIPTERA: SIMULIIDAE)

1970 ◽  
Vol 102 (1) ◽  
pp. 118-128 ◽  
Author(s):  
B. V. Peterson
Keyword(s):  
Related Species ◽  
Review Of The Literature ◽  
Closely Related Species ◽  
Larval Stages ◽  
Male Pupa ◽  
First Descriptions

AbstractThe identities of three closely related species, Prosimulium dicum, P. exigens, and P. dicentum, described by Dyar and Shannon in 1927, are clarified. Keys for the separation of the adult, pupal, and larval stages of these species are given. Also presented is a brief review of the literature for each species. A redescription of the female and first descriptions of the male, pupa, and larva of P. dicentum are provided and important taxonomic features illustrated. A lectotype is designated for P. dicum.

Description of the larval stages of Heterosternuta diversicornis (Sharp) (Coleoptera: Dytiscidae, Hydroporinae)

1998 ◽  
Vol 29 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Y. Alarie ◽  
K. Fritz
Keyword(s):  
Related Species ◽  
Abdominal Segment ◽  
Close Similarity ◽  
Maximum Width ◽  
Closely Related Species ◽  
Larval Instars ◽  
Larval Stages ◽  
First Instar

AbstractDescription of structures of all three larval instars of Heterosternuta diversicornis (Sharp) is presented. The chaetotaxy and porotaxy of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi are discussed in detail. A close similarity between larvae of H. diversicornis, H. wickhami Zaitzev and H. cocheconis (Fall) is confirmed. All three species distinguish from the closely related species of the genus Neoporus Guignot by (i) a very short and constricted siphon, (ii) the primary setae FE8 and FE9 which are subequal in length to the maximum width of the metafemur (first instar), (iii) the absence of natatory setae on all tibiae and tarsi, and (iv) the contiguous position of the primary setae UR2 and UR3 on the urogomphomere 1.

Description of Longidorus diadecturus n. sp. (Nematoda: Longidoridae), a vector of the peach rosette mosaic virus in peach orchards in southwestern Ontario, Canada

1982 ◽  
Vol 60 (2) ◽  
pp. 112-115 ◽  
Author(s):  
Eldon S. Eveleigh ◽  
W. R. Allen
Keyword(s):  
Mosaic Virus ◽  
Related Species ◽  
The Body ◽  
Virus Vector ◽  
Closely Related Species ◽  
Larval Stages ◽  
Posterior Position

Longidorus diadecturus n. sp., a virus vector found in peach orchards in southwestern Ontario, is described and illustrated. The most distinguishing feature of the species is the posterior position of the stylet guiding ring (50–64 μm posterior to head apex). It differs from closely related species with a posterior stylet guiding ring by the shape and length of the corpal mucro (sagittate, 1–2 μm), the length of the odontophore (55–66 μm), the expanded, set-off head, and the anteriorly located vulva (44–48%). The body lengths and the tail shapes and sizes are also diagnostic for larval stages.

Notes on the Comparative Reproductive-Biology and the Laboratory Breeding of the Rabbit Flea Xenopsylla-Cunicularis Smit (Siphonaptera, Pulicidae)

1990 ◽  
Vol 38 (5) ◽  
pp. 527 ◽  
Author(s):  
BD Cooke
Keyword(s):  
Relative Humidity ◽  
Reproductive Biology ◽  
Related Species ◽  
Breeding Biology ◽  
Wild Rabbit ◽  
Closely Related Species ◽  
Larval Stages ◽  
Large Numbers ◽  
C 50 ◽  
Laboratory Breeding

The basic breeding biology of the rabbit flea Xenopsylla cunicularis Smit, 1957 is described, and comparisons are made with other closely related species of Xenopsylla and with Spilopsyllus cuniculi (Dale, 1878), another parasite of the wild rabbit. At 22�C and 80% relative humidity the eggs of X. cunicularis hatch 7-8 days after laying, and the larval stages last 8-9 days. Pupation lasts for a further 20 days for females and 27 days for males. However, at lower relative humidities (22�C, 50% RH) rates of development are slowed considerably. A method for rearing large numbers of X. cunicularis in the laboratory is described.

Illustrated key for the identification of the known zoeal stages of brachyuran crabs (Crustacea: Decapoda) from tropical and subtropical Brazil, southwestern Atlantic

Zootaxa ◽  
2012 ◽  
Vol 3204 (1) ◽  
pp. 1 ◽  
Author(s):  
ANDREA G. KOETTKER ◽  
PAULO Y.G. SUMIDA ◽  
RUBENS M. LOPES ◽  
ANDREA S. FREIRE
Keyword(s):  
Related Species ◽  
Morphological Differentiation ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
Closely Related Species ◽  
Larval Stages ◽  
Genus Level ◽  
Brachyuran Crabs

Approximately 370 brachyuran species have so far been recorded from the Brazilian coast, 123 of which have had theirlarval stages fully or partially described. The pictorial guide allows the identification of the first zoea of 110 species. Theremaining 13 species with known larval stages are treated to the genus level because of difficulties in the morphological differentiation of closely related species.

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